They’re somehow worse than other settler countries like Argentina and Australia.

I wouldn't go that far. Australia discovered a "loophole" with the indigenous population; just declare that they aren't human, they're just more of the local fauna, and therefore you don't actually need to worry about making treaties with them that you break later, you can just massacre them like an animal.

Also fun fact, Aboriginal people weren't given human rights in this country until a 1967 referendum. And also depressing fact, there has been a massive propaganda push in the last few years to try and claim that it is a "myth" that Aboriginal people were treated poorly before that referendum, and because google is google and wikipedia is wikipedia, you can't even find information on it anymore, only information telling you it is a "myth" now.

I'll be sure to tell my Aboriginal friends that their generation trauma is just a myth, what a relief!